1.04907 Supelco

Potassium bromide

for IR spectroscopy Uvasol®

Synonym: Hydrobromic Acid Potassium Salt, Potassium bromide

  • CAS Number 7758-02-3

  • Empirical Formula (Hill Notation) BrK

  • Molecular Weight 119.00

  •  MDL number MFCD00011358

  •  EC Index Number 231-830-3



Related Categories IR Solvents, Solvent by Application, Solvents, Spectrophotometric Solvents, Spectroscopy Solvents (IR, NMR, UV/Vis) More...
Quality Level   100
vapor pressure   1.3 hPa ( 795 °C)
potency   >2000 mg/kg LD50, oral (Rat)
pH   5.5-8.5 (20 °C, 50 g/L in H2O)
bp   1435 °C/1013 hPa
mp   730 °C
solubility   650 g/L
density   2.75 g/cm3 at 20 °C
bulk density   900‑1000 kg/m3
InChI   1S/BrH.K/h1H;/q;+1/p-1
storage conditions   Store at +5°C to +30°C.


General description

Potassium bromide is transparent from the near UV to long wave IR wavelengths. In IR-spectroscopy, solid samples which are difficult to melt or dissolve in any suitable IR-transmitting solvent, are analyzed by grinding with Potassium bromide powder, and pressing into a disc. This procedure has a high quality demand of the used potassium bromide. Potassium bromide Uvasol is adjusted to a mean particle size of 150 μm. This is sufficient for the preparation of perfectly good pellets without the need for further pre-treatment and the associated risk of contamination. It also retains its powdery form over a period of years if stored in an air-tight condition. Its physical suitability for pelletising is checked by a special application test and its chemical purity established by full spectrum FT-IR analysis.


Replaces: PX1378

Analysis Note

Application test: passes test
Absorbance(2g pressed disk, 0.5 cm layer thickness)(Water; 3775-3050/1760-1520 cm⁻¹): ≤ 0.15
Absorbance(2g pressed disk, 0.5 cm layer thickness)(CH-compounds; 3050-2750 cm⁻¹): ≤ 0.004
Absorbance(2g pressed disk, 0.5 cm layer thickness)(other ; 4000-400 cm⁻¹): ≤ 0.020
Particle Size (d10): ≤ 100 µm
Particle Size (d50): ≤ 200 µm
Particle Size (d90): ≤ 500 µm

Legal Information

UVASOL is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety & Documentation

Safety Information

GHS07  GHS07
Signal word 
Hazard statements 
Precautionary statements 
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable
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